AO for animations ?

[mmikee]

Im looking for a method of rendering AO for animation.
Any ideas ? I have a AO script, but I think it only does 1 frame at
a time.

Thanks,
Mike

[jacksc02]

you can do a dirt/AO pass in mental ray and composite later

[instinct]

all of the later builds come with an AO shader called vraydirt. wich works like a charm...i thought this was in the last official build too ??

Thorsten

[Dynedain]

all of the later builds come with an AO shader called vraydirt. wich works like a charm...i thought this was in the last official build too ??

Thorsten

Nope, this is only in the closed-beta builds that you have to request, it is not in 1.47.03. It also is only an AO map, not a full shader.

[instinct]

well it is a map yep...but that makes it even more flexible then an ao shader, because you can also use it to render AO on specific objects directly without having to render a seperate pass.

Thorsten

[Da_elf]

can someone show a tutorial link in AOs use?

[instinct]

you mean the VrayDirt map ? Dont have a tut handy but it's easy to use. Basically it generates an alpha for itself. So in order to create a material to use in mat override for an ao pass you take a standard mat. make it fully white diffuse, and 100% self-illuminated. Then add the VrayDirt map to the diffuse map slot and set settings as desired/needed. That's it. It's crucial to set the mat to white instead of grey! because the AO darkening is basically black with an alpha (if you add an image with alpha channel to the diffuse slot you will also see the original diffuse colour where the alpha is black).

hope that helps,
Thorsten

[Da_elf]

i mean how an AO map is used in production on the comping side of things

[instinct]

ah, ic...well usually i simply multiply it over the diffuse pass (or the beauty pass in case no passes are rendered).

Thorsten

[percydaman]

yup thats the basics of it. I usually do some adjusting to the map (curves and such) and find 50% opacity or blend is about right. I also like to tint the AO map some to raise the overall warmth of the image.

[mmikee]

Thanks for all the info. Very interesting. I did some minor testing on some stills. Interesting results. But I would need to do many frames.

Regards,
Mike

[Clifton Santiago]

How can I use Vray Dirt if I only have 1.47.03? Are all of you beta testers?

[GALACTUS]

Here is a few links

http://www.everflow.com/support/tuto...cclusion1.html

http://www.ozgurustundag.com/gallery...rial_Page1.htm

http://art4all-all4art.com/News/article/sid=34.html

Also

http://www.chaosgroup.com/forum/phpB...hlight=nichols

While he is not using AO parts of the methodoly applies, particularly with the comping.

Colin